Digital watermark method against geometrical attack based on image characteristic region

An anti-geometric attack, feature area technology, applied in the field of information security, can solve the problems of difference error, influence watermark detection, watermark detection influence, etc.

Inactive Publication Date: 2007-09-05
XIDIAN UNIV
View PDF1 Cites 21 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] (2) In the watermark embedding process, the original watermark needs to be converted into the same size and shape as the triangle image block, and the triangle image block needs to be transformed into the same size and shape as the original watermark during watermark detection. These two processes There is an interpolation operation in , which leads to difference e...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Digital watermark method against geometrical attack based on image characteristic region
  • Digital watermark method against geometrical attack based on image characteristic region
  • Digital watermark method against geometrical attack based on image characteristic region

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0060] The present invention will be described in further detail below with reference to the accompanying drawings.

[0061] With reference to accompanying drawing 3 and Fig. 5, the watermark embedding step of the present invention is as follows:

[0062] Step 1: Extract the circular feature region where the watermark is embedded.

[0063] For the original image in Figure 5(a), the Harris corner detection method is used to extract feature points, and the initially extracted feature points are shown in Figure 5(b). For an image I(x, y), the extraction steps of Harris feature points are as follows:

[0064] (1) Calculate the gradient image using the following formula:

[0065] X = I ⊗ ( - 1,0,1 ) = ∂ I / ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

A digital watermark method resisting against geometric attack includes relating watermark information to image character region, generating local character region with invariance on geometric attack by utilizing most stable Harris character point in image, making said region to be round character region by image normalization, carrying out two-stages of wavelet transforms on these round character regions, selecting revision coefficient regions to embed watermark at the second stage wavelet transform and realizing watermark-embedding. The method for picking up watermark is also disclosed.

Description

technical field [0001] The present invention relates to the technical field of information security, specifically a digital watermarking method, which can effectively resist geometric attacks such as translation, rotation, and local shearing, as well as conventional signal processing attacks, and can be used for digital images on the Internet. Copyright Protection. Background technique [0002] The rapid development of computer technology and Internet technology makes it easy for people to share resources. The use of digital images, audio and video has also greatly facilitated their widespread dissemination on the Internet, but at the same time it has also created a serious problem of copyright protection. Digital watermarking technology is considered to be an advantageous means of copyright protection for digital images. It embeds certain copyright information into images and extracts them as proof of copyright owners when copyright disputes occur. Since the early 1990s, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G06T1/00
Inventor 郭宝龙李雷达
Owner XIDIAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap